/*
 * Copyright (c) 2010. raoqn
 */

package com.yfeng.common.action;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Random;

/**
 * www.goodjuhome.com
 * Created by IntelliJ IDEA.
 * User: rqn
 * Date: 2010-8-14
 * Time: 16:42:15
 */
@Controller("authImgAction")
public class AuthImgAction {

    private static Log log = LogFactory.getLog(AuthImgAction.class);

    @RequestMapping("/authImg")
	protected void processRequest(HttpServletRequest request, HttpServletResponse response)
	{
		try{
		response.setContentType("image/jpeg");
		response.setHeader("Pragma","No-cache");
		response.setHeader("Cache-Control","no-cache");
		response.setDateHeader("Expires", 0);
		HttpSession session=request.getSession();
		// 在内存中创建图象
		int width=60, height=20;
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

		// 获取图形上下文
		Graphics g = image.getGraphics();

		//生成随机类
		Random random = new Random();

		// 设定背景色
		g.setColor(getRandColor(200,250));
		g.fillRect(0, 0, width, height);

		//设定字体
		g.setFont(new Font("Times New Roman",Font.PLAIN,18));

		//画边框
		//g.setColor(new Color());
		//g.drawRect(0,0,width-1,height-1);


		// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
		g.setColor(getRandColor(160,200));
		for (int i=0;i<155;i++) {
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			int xl = random.nextInt(12);
			int yl = random.nextInt(12);
			g.drawLine(x,y,x+xl,y+yl);
		}

		// 取随机产生的认证码(4位数字)
		String sRand="";
		for (int i=0;i<4;i++){
			String rand=String.valueOf(random.nextInt(10));
			sRand+=rand;
			// 将认证码显示到图象中
			g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));//调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
			g.drawString(rand,13*i+6,16);
		}

		// 将认证码存入SESSION
		session.setAttribute("rand",sRand);
		// 图象生效
		g.dispose();
		ServletOutputStream responseOutputStream =response.getOutputStream();
		// 输出图象到页面
		ImageIO.write(image, "JPEG", responseOutputStream);

		//以下关闭输入流！
		responseOutputStream.flush();
		responseOutputStream.close();
		}catch(Exception e){
			log.error(e.getMessage(),e);
		}
	}
	private Color getRandColor(int fc,int bc){//给定范围获得随机颜色
		Random random = new Random();
		if(fc>255) fc=255;
		if(bc>255) bc=255;
		int r=fc+random.nextInt(bc-fc);
		int g=fc+random.nextInt(bc-fc);
		int b=fc+random.nextInt(bc-fc);
		return new Color(r,g,b);
	}
}
